Electric fixture



F. L. BUTLER.

ELECTRIC FIXTURE.

APPLICATION FILED SEPT. 2. 1921.

1,423,646. Patented July 25, 1922.

l/JVEll/TOR ,4 TTORNEZS' FRANK LowELL BUTLER, or orrroeeo, ILLrriors.

ELECTRIC FIXTURE.

Original application filed November 12, 192i), Serial No. 423,636.

September 2, 1921.

To all whom it may concern:

Be itknown that I, FRANK LOWELL BUT- Lnii, a citizen: of the United States, and a resident of-Chicago, in the county of Cook My invention relates to improvements in electric fixtures, and it consists in the com-.

vbinations, constructions. and arrangements herein described and claimed.

An object of my invention is to provide an improvement over the electric fixture shown in my prior application for patent, filed October'2, 1920, in which I disclosed an insulated stem comprising an insulating nipple having its upper end screwed into a coupling secured to a fixed support and carrying on its lower end a cap formed with a threaded central opening adapted to receive the threaded end of a rod that carries at its lower end a member suitable for connection with and for supporting a lighting fixture element, said improvement consisting in the provision of an insulating member havinga central bore adapted to receive an ordinary tubular member formed with a so-called running thread and having means for limiting the movement of the tubular member within the insulating nipple and for maintaining the same in adjusted position therein.

A further object of my invention is to provide a device of the type described that comprises elements that can be assembled quickly and easily, whereby the device can be properly installed with a minimum of time and effort.

A further object of my invention is'to provide a device of the type described in which the number of component elements is reduced to a minimum.

A further object of my invention is to provide a device of the type described that is effective for the purpose intended and thoroughly practical commercially.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claim.

This application is a division of. my prior application for Letters Patent for electric fixture, filed November 12, 1920, Serial No. 423,636.

Specification of Letters Patent.

Patented July teas.

Divided. and. this application filed Serial No. 498,125.

My invention is illustrated in the accompanying drawings forming part of this application, in which- Figure 1 is a central section through. the device, showing the use and application thereof, and

Figure 2 is a plan view of a portion of the device.

In carrying out my invention, I make use of a fixed support, such as a gas pipe 1, depending from a ceiling 2. A tubular insulai ing member 3 is threaded exteriorly at 4 adjacent to one end for engagement with an interiorly threaded coupling 5. The latter is attached to the gas pipe 1. d I

The tubular insulatingmember 3, which is formed of indurated fibre or a like mate rial, is threaded exteriorly adjacent to its free end, as at 6. A suspension member having thcform of a cap 7 is fashioned with a cylindrical portion 8 threaded interiorly for engagement with the exteriorly threaded free end portion of the insulating member 3 and is secured thereon in adjusted posi' tion by means of a pin 9 projected through registering openings in the cylindrical porti on 8 and the tubular insulating member 3, as clearly shown in the drawings. The pin 9 has another function as will presently appear. The tubular insulatingmember 3 is further secured in threaded engagement with the coupling 5 by means of a pin 10 projected through registering openings in the coupling and in the tubular insulating member.

The cap 7 is formed with a threaded central opening 11 axially alined with the bore of the tubular insulating member 3 and substantially equal diametrically with the latter. A tube 12 having a socalled running thread 13 extending the length thereof is screwed into the threaded opening 11 until the upper end thereof abuts the pin 9, whereby further axial movement of the tube 12 in the bore of the tubular insulating member 3 is prevented. The threaded tube 12 is of conventional form, such as is commonly used in the installation and assembly of electric fixtures. It is cut to a suitable length and a canopy 14: is then projected over the free end thereof until the upper end of the canopy abuts the ceiling wall 2. A nut 15 is screwed on the lower end of the tube 12 and maintains the canopy 14: in position. The canopy 14c is provided with a plurality of spaced apart openings 16 extending through its wall as shown, each being adapted to receive the tubular shank 17 of an eye member 18. Each eye member 18 is held in adjusted position relative to the canopy by a nut 19 screwed on the threaded portion of the tubular shank 17 interiorly of the canopy wall, whereby a shoulder 20 formed on each tubular shank eXteriorly of the canopy casing is clamped to the latter. Chains 21engage with the eye members 18 and may be operatively connected with a chandelier or other lighting fixture, none being shown, to support the latter. Electrical conducting wires 22 are projected into the canopy through the bores of the tubular shanks 1? for connection with the wires, not shown, that are ordinarily installed in the ceiling 2.

Form the foregoing description of the va rious parts of the device, the operation thereof may be readily understood. Since the suspension member 7 is adapted for engagement with an ordinary tube with a running thread, the length of the tube may be varied as required in each installation. A desired length of the tube is cut from a standard length of this element of the device. It will be observed that the nut 15 screwed on the threaded tube for maintaining the canopy in adjusted position is formed with a hollow depending portion 23 adapted to be grasped by hand to permit convenient operation of the nut and into which the free end of the threaded tube may extend, whereby the length of the threaded tubes used in like installations vary considerably without rendering the same unsuitable for the purpose intended. I claim: y In an electric fixture, a coupling adapted to be secured to a fixed support, an exteriorly threaded insulating tubular member screwed into said coupling, a pin projected transversely through said coupling and tube, a cap having an interiorly threaded cylindrical portion adapted to receive the free end of said tube, a second pin projected transversely through said cap and said tube, whereby said cap and said coupling will turn as a unit, said cap having a threaded "bore therein, and a threaded canopy supporting. rod screwed into said bore, 'said rod being adaptedto' abut said second namedp'in.

FRANK LOWELL BUTLER; 

